Liao, Yu-ChinYu-ChinLiaoChen, Po-SungPo-SungChenLi, Chao-HsiuChao-HsiuLiTsai, Pei-HuaPei-HuaTsaiJang, Jason S. C.Jason S. C.JangHsieh, Ker-ChangKer-ChangHsiehChen, Chih-YenChih-YenChenLin, Ping-HungPing-HungLinHuang, Jacob C.Jacob C.HuangHSIN-JAY WULo, Yu-ChiehYu-ChiehLoHuang, Chang-WeiChang-WeiHuangTsao, I-YuI-YuTsao2024-09-182024-09-182020https://www.scopus.com/record/display.uri?eid=2-s2.0-85078541262&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/721163A novel lightweight Al-Ti-Cr-Mn-V medium-entropy alloy (MEA) system was developed using a nonequiatiomic approach and alloys were produced through arc melting and drop casting. These alloys comprised a body-centered cubic (BCC) and face-centered cubic (FCC) dual phase with a density of approximately 4.5 g/cm3. However, the fraction of the BCC phase and morphology of the FCC phase can be controlled by incorporating other elements. The results of compression tests indicated that these Al-Ti-Cr-Mn-V alloys exhibited a prominent compression strength (~1940 MPa) and ductility (~30%). Moreover, homogenized samples maintained a high compression strength of 1900 MPa and similar ductility (30%). Due to the high specific compressive strength (0.433 GPag/cm3) and excellent combination of strength and ductility, the cast lightweight Al-Ti-Cr-Mn-V MEAs are a promising alloy system for application in transportation and energy industries. © 2020 by the authors.High-entropy alloyLightweight alloyMechanical propertyMedium-entropy alloyjournal article10.3390/e220100742-s2.0-85078541262